There's lot of members from Russia and Eastern European groups who have immigrated to other countries, not only to facilitate the movement of drugs, arms, prostitutes, etc., but also to live. So it makes them seem more dispersed.

The Italians don't seem to have the same "diaspora." Most remain in their home country and their activities in other countries mostly revolve around the part of the drug trade they control, as well as laundering money in various legitimate businesses.